JSP仿百度分页，谷歌分页页码处理

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百度 JSP DAO Bean 出版

像百度一样的jsp分页效果，像goolge一样的分页效果！
根据设定参数一次取一页记录内容显示

jsp页面代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%@ page import="dao.*"%>
<%@ page import="bean.*"%>
<html>
	<head>
	</head>
	<body>
		<%
			int pagesize = 10;//每页显示记录数
			int liststep = 10;//最多显示分页页数
			int pages = 1;//默认显示第一页
			if (request.getParameter("pages") != null) {
				pages = Integer.parseInt(request.getParameter("pages"));//分页页码变量
			}
			int count = PageDao.getmaxpagecount();//假设取出记录总数
			int pagescount = (int) Math.ceil((double) count / pagesize);//求总页数，ceil（num）取整不小于num
			if (pagescount < pages) {
				pages = pagescount;//如果分页变量大总页数，则将分页变量设计为总页数
			}
			if (pages < 1) {
				pages = 1;//如果分页变量小于１,则将分页变量设为１
			}
			int listbegin = (pages - (int) Math.ceil((double) liststep / 2));//从第几页开始显示分页信息
			if (listbegin < 1) { //当前页-(总显示的页列表数/2)
				listbegin = 1;
			}
			int listend = pages + liststep / 2;//分页信息显示到第几页//当前页+(总显示的页列表数/2)
			if (listend > pagescount) { 
				listend = pagescount + 1;
			}
		%>
		<table align="center">
			<tr>
				<th>
					图书编号
				</th>
				<th>
					图书名称
				</th>
				<th>
					出版社
				</th>
				<th>
					作者
				</th>
				<th>
					价格
				</th>
			</tr>
			<%
				List<Book> list = PageDao.getAllPageInfo(pages);
				Iterator<Book> it = list.iterator();
				while (it.hasNext()) {
					Book b = it.next();
					if (b.getId() % 2 == 0) {
						out.println("<tr bgcolor='blue'>");
					} else {
						out.println("<tr bgcolor='red'>");
					}
			%>
			<td><%=b.getId()%></td>
			<td><%=b.getBookname()%></td>
			<td><%=b.getBookpublish()%></td>
			<td><%=b.getBookauthor()%></td>
			<td><%=b.getBookprice()%></td>
			<%
				out.println("<tr bgcolor='red'>");
				}
			%>
		</table>
		<table align="center">
			<tr>
				<%
					//<显示分页信息
					//<显示上一页
					if (pages > 1) {
						out.println("<td><a href=?pages=" + (pages - 1)
								+ ">上一页</a></td>");
					}//>显示上一页
					//<显示分页码
					for (int i = listbegin; i < listend; i++) {
						if (i != pages) {//如果i不等于当前页
							out.println("<td><a href=?pages=" + i + ">[" + i
									+ "]</a></td>");
						} else {
							out.println("<td>[" + i + "]</td>");
						}
					}//显示分页码>
					//<显示下一页
					if (pages != pagescount) {
						out.println("<td><a href=?pages=" + (pages + 1)
								+ ">下一页</a></td>");
					}//>显示下一页
					//>显示分页信息
				%>
			</tr>
		</table>
	</body>
</html>

Dao层代码:

package dao;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import bean.Book;

public class PageDao {
	public static int getmaxpagecount() {
		int num = 0;
		Connection conn = null;
		Statement stm = null;
		ResultSet rs = null;
		try {
			conn = ConnectionManager.getInstances();
			stm = conn.createStatement();
			rs = stm.executeQuery("select count(*) from book");
			if (rs.next()) {
				num = rs.getInt(1);
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return num;
	}

	public static List<Book> getAllPageInfo(int curpage) {
		List<Book> list = new ArrayList<Book>();
		Connection conn = null;
		Statement stm = null;
		ResultSet rs = null;

		try {
			conn = ConnectionManager.getInstances();
			conn.setAutoCommit(false);
			stm = conn.createStatement();
			rs = stm
					.executeQuery(("select top 10 * from book where id not in (select top "
							+ ((curpage - 1) * 10) + " id from book order by id)order by id"));
			while (rs.next()) {
				Book b = new Book();
				b.setId(rs.getInt("id"));
				b.setBookname(rs.getString("bookname"));
				b.setBookpublish(rs.getString("bookpublish"));
				b.setBookauthor(rs.getString("bookauthor"));
				b.setBookprice(rs.getDouble("bookprice"));
				list.add(b);
			}
			conn.commit();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				rs.close();
				stm.close();
				conn.close();
			} catch (SQLException e) {
				try {
					conn.rollback();
				} catch (SQLException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
				e.printStackTrace();
			}
		}
		return list;
	}
}

连接代码:

package dao;
import java.sql.*;
public class ConnectionManager {
	
	public static final String DRIVER="com.microsoft.jdbc.sqlserver.SQLServerDriver";
	public static final String URL="jdbc:microsoft:sqlserver://127.0.0.1:1433;databasename=pagination";
	public static final String UID="sa";
	public static final String PWD="112233";
	
		public static Connection getInstances(){
			Connection conn=null;
			
			try {
				Class.forName(DRIVER);
				conn=DriverManager.getConnection(URL,UID,PWD);
			} catch (ClassNotFoundException e) {
					e.printStackTrace();
				} catch (SQLException e) {

				e.printStackTrace();
			}
			return conn;
		}
}

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